package/qt5/qt5base: disable predefined -Og optimization

Starting from Qt5 5.9.0, -optimize-debug is enabled by default for
debug builds causing -Og flag to be appended to CFLAGS and
consequently override TARGET_CFLAGS. We don't want this so let's pass
-no-optimize-debug to QT5BASE_CONFIGURE_OPTS if QT5_VERSION_LATEST=y.

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 5857ab6a96be17615a05ff4e6a91d8f475890980)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qt5/qt5base/qt5base.mk

@@ -27,6 +27,13 @@ QT5BASE_CONFIGURE_OPTS += \
 	-no-pch \
 	-shared
 
+# starting from version 5.9.0, -optimize-debug is enabled by default
+# for debug builds and it overrides -O* with -Og which is not what we
+# want.
+ifeq ($(BR2_PACKAGE_QT5_VERSION_LATEST),y)
+QT5BASE_CONFIGURE_OPTS += -no-optimize-debug
+endif
+
 ifeq ($(BR2_PACKAGE_QT5_VERSION_5_6),y)
 QT5BASE_DEPENDENCIES += pcre
 else